Update build number to 27
Simplified code by hidding unused sections

Each section is now constant and unused ones are hidden instead of
rearranging the section numbers. This makes it easier to allow
animations when completing and deleting tasks.
Updated Crashlytics framework
Hopefully prevent crash when clicking on contact developer button

Still no idea why this happened a couple times.
Merge branch 'master' of github.com:dacohn/RemindMe

* 'master' of github.com:dacohn/RemindMe:
  Improved sentence format